20775331 has 2 divisors, whose sum is σ = 20775332. Its totient is φ = 20775330.

The previous prime is 20775329. The next prime is 20775383. The reversal of 20775331 is 13357702.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20775331 - 2¹ = 20775329 is a prime.

It is a super-2 number, since 2×20775331² = 863228756319122, which contains 22 as substring.

Together with 20775329, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20775331.

It is not a weakly prime, because it can be changed into another prime (20775031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10387665 + 10387666.

It is an arithmetic number, because the mean of its divisors is an integer number (10387666).

Almost surely, 2^20775331 is an apocalyptic number.

20775331 is a deficient number, since it is larger than the sum of its proper divisors (1).

20775331 is an equidigital number, since it uses as much as digits as its factorization.

20775331 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4410, while the sum is 28.

The square root of 20775331 is about 4557.9963799898. The cubic root of 20775331 is about 274.9050074111.

The spelling of 20775331 in words is "twenty million, seven hundred seventy-five thousand, three hundred thirty-one".